Difference between revisions of "ETRA SOM/ETRA Evaluation Kit/Interfaces and Connectors/RTC"

From DAVE Developer's Wiki
Jump to: navigation, search
(Created page with "{{subst:EVB_Interfaces_and_Connectors | nome-som=ETRA | nome-peripheral =RTC}}")
 
Line 1: Line 1:
−
<section begin=History/>
+
<section begin="History" />
 
{| style="border-collapse:collapse; "
 
{| style="border-collapse:collapse; "
−
!colspan="4" style="width:100%; text-align:left"; border-bottom:solid 2px #ededed"|History
+
! colspan="4" style="width:100%; text-align:left" ; border-bottom:solid 2px #ededed" |History
 
|-  
 
|-  
−
!style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white"|Version
+
! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white" |Version
−
!style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white"|Issue Date
+
! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white" |Issue Date
−
!style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white"|Notes
+
! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white" |Notes
 
|-
 
|-
−
|style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000"|X.Y.Z
+
| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |1.0.0
−
|style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000"|Month Year
+
| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |Dec 2020
−
|style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000"|TBD
+
| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |First Release
 
|-
 
|-
−
|-
 
−
|style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000"|[TBD_link X.Y.Z]
 
−
|style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000"|Month Year
 
−
|style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000"|TBD
 
−
|-
 
−
|style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000"|...
 
−
|style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000"|...
 
−
|style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000"|...
 
 
|-
 
|-
 
|}
 
|}
−
<section end=History/>
+
<section end="History" />
−
<section begin=Body/>
+
<section begin="Body" />
  
−
==RTC interface ==
+
==RTC device ==
−
 
 
−
''TBD: sostituire le sezioni con le informazioni sull'uso della periferica e del suo connettore''
 
−
''Nell'esempio di seguito c'è la descrizione dell'interfaccia UART/console''
 
  
 
=== Description  ===
 
=== Description  ===
 +
There are two RTC devices on the Evaluation Kit, one is provided by the STM32MP1 SoC, the other is a Maxim DS3232M I2C device.
  
−
The RTC interface available on the Evaluation Kit at the connector ''TBD:Jxxx''.
+
Both RTC can retain time and custom data over blackouts using a backup power source as:
−
 
+
* the lithium rechargeable battery (BT1) that is mounted on the carrier board.
−
''Jxx'' is a ''TBD:connector-type'' header connector for the RS232 two-wires UART3 port, used for debug purposes (bootloader and operating system serial console).
+
* an external battery connected to J3 (alternate mounting option to the battery)
−
 
 
  
 
[[File:{{{nome-som}}-EVB-RTC-connector.png|thumb|center|500px|RTC connector]]
 
[[File:{{{nome-som}}-EVB-RTC-connector.png|thumb|center|500px|RTC connector]]
Line 40: Line 29:
 
===Signals ===
 
===Signals ===
  
−
The following table describes the interface signals:
+
The following table describes the interface signals for J3:
  
 
{| class="wikitable"  
 
{| class="wikitable"  
−
! latexfontsize="scriptsize"| Pin#
+
! latexfontsize="scriptsize" | Pin#
−
! latexfontsize="scriptsize"| SOM Pin#
+
! latexfontsize="scriptsize" | SOM Pin#
−
! latexfontsize="scriptsize"| Pin name
+
! latexfontsize="scriptsize" | Pin name
−
! latexfontsize="scriptsize"| Pin function
+
! latexfontsize="scriptsize" | Pin function
−
! latexfontsize="scriptsize"| Pin Notes
+
! latexfontsize="scriptsize" | Pin Notes
−
|-
 
−
|1,2,4,6,,7,8,10
 
−
| -
 
−
| N.A.
 
−
| N.C.
 
−
| Not connected
 
 
|-
 
|-
−
| 3
+
|1
−
| J1.189
+
| J18.14
−
| RS232_RX
+
| VBAT
−
| Receive line
 
 
|  
 
|  
 +
| can be configured for recharge
 
|-
 
|-
−
| 3
+
| 2
−
| J1.187
 
−
| RS232_TX
 
−
| Transmit line
 
−
|
 
−
|-
 
−
| 9
 
 
| -
 
| -
 
| DGND
 
| DGND
Line 75: Line 52:
  
 
=== Device mapping ===
 
=== Device mapping ===
−
UART3 is mapped to <code>/dev/ttymxc2</code> device in Linux. The peripheral is used as the default serial console, both for the bootloader and the kernel.
+
RTC is mapped to <code>/dev/rtc0</code> device in Linux.
  
 
=== Device usage ===
 
=== Device usage ===
  
−
To connect to the debug serial port:
+
The peripheral can be accessed through the <code>date</code> and <code>hwclock</code> linux commands.
−
 
 
−
# connect the DB9 adapter bracket to the J22 connector on the SBCX board
 
−
# connect a serial cable between DB9 connector and PC COM port through a NULL-modem cable (not provided)
 
−
# start your favorite terminal emulator software on PC (eg: PuTTY); communication parameters are: 115200,N,8,1
 
  
 
----
 
----
  
 
[[Category:ETRA]]
 
[[Category:ETRA]]

Revision as of 15:51, 31 December 2020

HOME SOMs SBCs ToloMEO Embedded Assistant Sale-tag.pngGET A QUOTE Customer-service.pngONLINE HELPDESK
Roadmap IoT Services ML/AI services Embedded Design Services
History
Version Issue Date Notes
1.0.0 Dec 2020 First Release


RTC device[edit | edit source]

Description[edit | edit source]

There are two RTC devices on the Evaluation Kit, one is provided by the STM32MP1 SoC, the other is a Maxim DS3232M I2C device.

Both RTC can retain time and custom data over blackouts using a backup power source as:

  • the lithium rechargeable battery (BT1) that is mounted on the carrier board.
  • an external battery connected to J3 (alternate mounting option to the battery)

[[File:{Template:Nome-som-EVB-RTC-connector.png|thumb|center|500px|RTC connector]]

Signals[edit | edit source]

The following table describes the interface signals for J3:

Pin# SOM Pin# Pin name Pin function Pin Notes
1 J18.14 VBAT can be configured for recharge
2 - DGND Ground

Device mapping[edit | edit source]

RTC is mapped to /dev/rtc0 device in Linux.

Device usage[edit | edit source]

The peripheral can be accessed through the date and hwclock linux commands.

HOME SOMs SBCs ToloMEO Embedded Assistant Sale-tag.pngGET A QUOTE Customer-service.pngONLINE HELPDESK
Roadmap IoT Services ML/AI services Embedded Design Services
Retrieved from "https://wiki.dave.eu/index.php?title=ETRA_SOM/ETRA_Evaluation_Kit/Interfaces_and_Connectors/RTC&oldid=12300"